New clues about how ancient galaxies lit up the Universe

NASA's Spitzer Space Telescope has revealed that some of the Universe's earliest galaxies were brighter than expected.

The excess light is a by-product of the galaxies releasing incredibly high amounts of ionising radiation.

The finding offers clues to the cause of the Epoch of Reionisation, a major cosmic event that transformed the universe from being mostly opaque to the brilliant starscape seen today.

The new work appears in a paper in Monthly Notices of the Royal Astronomical Society.

Researchers report on observations of some of the first galaxies to form in the universe, less than 1 billion years after the big bang (or a little more than 13 billion years ago).

The data show that in a few specific wavelengths of infrared light, the galaxies are considerably brighter than scientists anticipated.

The study is the first to confirm this phenomenon for a large sampling of galaxies from this period, showing that these were not special cases of excessive brightness, but that even average galaxies present at that time were much brighter in these wavelengths than galaxies we see today.

No one knows for sure when the first stars in our universe burst to life.

But evidence suggests that between about 100 million and 200 million years after the Big Bang, the Universe was filled mostly with neutral hydrogen gas that had perhaps just begun to coalesce into stars, which then began to form the first galaxies.

By about 1 billion years after the big bang, the Universe had become a sparkling firmament.

Something else had changed, too: Electrons of the omnipresent neutral hydrogen gas had been stripped away in a process known as ionisation.

The Epoch of Reionisation the changeover from a universe full of neutral hydrogen to one filled with ionised hydrogen is well documented.

Before this Universe-wide transformation, long-wavelength forms of light, such as radio waves and visible light, traversed the universe more or less unencumbered.

But shorter wavelengths of light including ultraviolet light, X-rays and gamma rays were stopped short by neutral hydrogen atoms.

These collisions would strip the neutral hydrogen atoms of their electrons, ionising them.

But what could have possibly produced enough ionizing radiation to affect all the hydrogen in the Universe? Was it individual stars? Giant galaxies? If either were the culprit, those early cosmic colonisers would have been different than most modern stars and galaxies, which typically don't release high amounts of ionising radiation.

To peer back in time to the era just before the Epoch of Reionisation ended, Spitzer stared at two regions of the sky for more than 200 hours each, allowing the space telescope to collect light that had travelled for more than 13 billion years to reach us.

As some of the longest science observations ever carried out by Spitzer, they were part of an observing campaign called GREATS, short for GOODS Re-ionization Era wide-Area Treasury from Spitzer.

GOODS (itself an acronym: Great Observatories Origins Deep Survey) is another campaign that performed the first observations of some GREATS targets.

The study also used archival data from the NASA / ESA Hubble Space Telescope.

Using these ultra-deep observations by Spitzer, the team of astronomers observed 135 distant galaxies and found that they were all particularly bright in two specific wavelengths of infrared light produced by ionising radiation interacting with hydrogen and oxygen gases within the galaxies.

This implies that these galaxies were dominated by young, massive stars composed mostly of hydrogen and helium.

They contain very small amounts of "heavy" elements (like nitrogen, carbon and oxygen) compared to stars found in average modern galaxies.

These stars were not the first stars to form in the Universe (those would have been composed of hydrogen and helium only) but were still members of a very early generation of stars.

The Epoch of Reionisation wasn't an instantaneous event, so while the new results are not enough to close the book on this cosmic event, they do provide new details about how the Universe evolved at this time and how the transition played out. ■